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Simplifying 20x + 5x + 20 = 21x + 4 Reorder the terms: 20 + 20x + 5x = 21x + 4 Combine like terms: 20x + 5x = 25x 20 + 25x = 21x + 4 Reorder the terms: 20 + 25x = 4 + 21x Solving 20 + 25x = 4 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 20 + 25x + -21x = 4 + 21x + -21x Combine like terms: 25x + -21x = 4x 20 + 4x = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 20 + 4x = 4 + 0 20 + 4x = 4 Add '-20' to each side of the equation. 20 + -20 + 4x = 4 + -20 Combine like terms: 20 + -20 = 0 0 + 4x = 4 + -20 4x = 4 + -20 Combine like terms: 4 + -20 = -16 4x = -16 Divide each side by '4'. x = -4 Simplifying x = -4
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